CZ 435 then AA 2143 at O'Hare
Anchorage → Chicago → Boston
Timetable, Chicago time
15:58CZ 435 from Anchorage at the gate
08:29AA 2143 to Boston leaves the gate
16 h 31 apart on the timetable, overnight
AA 2143 leaves 16 h 31 after CZ 435 arrives on the timetable: more than half a day, so not a connection we count.